Very few games are created that allow you to manage an airline, the only ones i know are:
-Air Bucks
-Airpro
-Airpro 2000
-Airpro 2007
-Airline 5
-Airline 6
-Airline Online (requires any other airline)
-Airline corporate
-Airlines
-Airlines 2
-Airline tycoon, and well thats about it. There may be a few I've missed, so please if you know anymore, please post a comment with the name.

But how do you make YOUR own airline game?

Well, the answer is right in-front of you. Far too many people feel that it needs graphics and endless codes. You don't, all you need is a bit of knowledge (easily done on the internet) and that is on...

Spread Sheets.
Ie. EXCEL 2000-XP Lotus 1-2-3

In my airline games (airline, airline 1.1, airline 1.2, airline 1.3) I have a basic balance, Profit, bases, routes and aircraft. And through out time, after bits of research, by most up to date version has...
-Ability to make your own airline name
-Real aircraft
-Soar through 12 months of business
-Inflight services, from hot towels to LCD TVs
-Real bases
-Real routes

(Just to let you know 1.4 is coming out, with more ability's, and being able to take out a loan)

But don't just listen to me talking, all you need is a balance, profit, base, routes and aircraft. Virtually everything in the first one.
As you go on, your games will get better, and soon, maybe, you could be running the next aviation business game success!

I've been thinking about creating a game of my own for a while but for it to be truly intriguing and challenging it must be more complex and needs a strong graphical quality to it. If you too are coding your own game maybe we can collaborate.